scholarly journals Comparison of Two Harvest Methods for Lettuce Production in an Aquaponic System

2016 ◽  
Vol 9 (1) ◽  
pp. 64 ◽  
Author(s):  
Gaylynn E. Johnson ◽  
Karen M. Buzby ◽  
Kenneth J. Semmens ◽  
Nicole L. Waterland
Keyword(s):  
Food Production ◽  
Total Yield ◽  
Harvest Time ◽  
Average Yield ◽  
Vegetable Crop ◽  
Weekly Basis ◽  
Optimal Harvest ◽  
Flow Through ◽  
Harvest Strategy ◽  
The Right

<p>Aquaponics is an integrated food production technology of aquaculture and hydroponics. Lettuce (<em>Lactuca sativa </em>L.) is an economically important vegetable crop that can be grown aquaponically. In addition to selecting the right choice of lettuce cultivars, developing an optimal harvest strategy could increase lettuce production. Lettuce production using two harvest methods, Cut-and-Come-Again (CC) and Once-and-Done (OD), was evaluated using ‘Red Sails’ lettuce in a flow-through aquaponic system rearing trout. With the CC method continual harvesting was possible on a weekly basis after the initial harvest, while it took five weeks for each harvest using the OD method. The total yield of lettuce by the CC method was 6.7 kg from 9 trays, while 22.6 kg of lettuce was harvested by the OD method using 54 trays. In harvests by the OD method, 6 times as many seeds were sown compared to the CC method. The average yield per tray harvested by the CC method (744.4 g/tray) was 78% higher than that by the OD method (418.5 g/tray) because the CC method used 6 times less trays. Productivity, calculated by the average yield per growing week, of the two harvest methods at the first harvest was similar, but 4.8 times higher in the CC method than in the OD method at the second harvest due to the shorter harvest time. However, visual and decay ratings of lettuce harvested by the CC method began to decline afterwards. Together, the OD method after two consecutive harvests by the CC method would help growers to obtain increased yield of quality lettuce.</p>

scholarly journals Combined Metabolome and Transcriptome Profiling Reveal Optimal Harvest Strategy Model Based on Different Production Purposes in Olive

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 360
Author(s):  
Guodong Rao ◽  
Jianguo Zhang ◽  
Xiaoxia Liu ◽  
Xue Li ◽  
Chenhe Wang
Keyword(s):  
Gene Expression ◽  
Olive Oil ◽  
Expression Patterns ◽  
Transcriptome Profiling ◽  
Minor Components ◽  
Harvest Time ◽  
Rna Seq ◽  
Optimal Harvest ◽  
Harvest Strategy ◽  
Different Color

Olive oil has been favored as high-quality edible oil because it contains balanced fatty acids (FAs) and high levels of minor components. The contents of FAs and minor components are variable in olive fruits of different color at harvest time, which render it difficult to determine the optimal harvest strategy for olive oil producing. Here, we combined metabolome, Pacbio Iso-seq, and Illumina RNA-seq transcriptome to investigate the association between metabolites and gene expression of olive fruits at harvest time. A total of 34 FAs, 12 minor components, and 181 other metabolites (including organic acids, polyols, amino acids, and sugars) were identified in this study. Moreover, we proposed optimal olive harvesting strategy models based on different production purposes. In addition, we used the combined Pacbio Iso-seq and Illumina RNA-seq gene expression data to identify genes related to the biosynthetic pathways of hydroxytyrosol and oleuropein. These data lay the foundation for future investigations of olive fruit metabolism and gene expression patterns, and provide a method to obtain olive harvesting strategies for different production purposes.

Management of Superior Vena Cava Occlusion Causing Bleeding “Downhill” Esophageal Varices

2021 ◽  
pp. 152660282198933
Author(s):  
Pablo V. Uceda ◽  
Julio Peralta Rodriguez ◽  
Hernán Vela ◽  
Adelina Lozano Miranda ◽  
Luis Vega Salvatierra ◽  
...  
Keyword(s):  
Superior Vena Cava ◽  
Esophageal Varices ◽  
Superior Vena ◽  
Vena Cava ◽  
Central Venous Catheters ◽  
Dialysis Patients ◽  
Central Venous ◽  
Endovascular Recanalization ◽  
Flow Through ◽  
The Right

The health care system in Peru treats 15,000 dialysis patients annually. Approximately 45% of patients receive therapy using catheters. The incidence of catheter-induced superior vena cava (SVC) occlusion is increasing along with its associated significant morbidity and vascular access dysfunction. One of the unusual manifestations of this complication is bleeding “downhill” esophageal varices caused by reversal of blood flow through esophageal veins around the obstruction to the right atrium. Herein is presented the case of an 18-year-old woman on hemodialysis complicated by SVC occlusion and bleeding esophageal varices who underwent successful endovascular recanalization of the SVC. Bleeding from “downhill” esophageal varices should be considered in the differential diagnosis of dialysis patients exposed to central venous catheters. Aggressive endovascular treatment of SVC occlusion is recommended to preserve upper extremity access function and prevent bleeding from this complication.

Legislative Proposals for Reversing the Cancer Epidemic and Controlling Run-Away Industrial Technologies

2000 ◽  
Vol 30 (2) ◽  
pp. 353-371 ◽  
Author(s):  
Samuel S. Epstein
Keyword(s):  
Food Production ◽  
Genetically Engineered ◽  
Right To Know ◽  
Criminal Sanctions ◽  
Adverse Impacts ◽  
The Right To Know ◽  
Legislative Proposals ◽  
Democratic Rights ◽  
Genetically Engineered Food ◽  
The Right

An interlocking legislative complex is proposed for the control of carcinogenic and other adverse impacts of established run-away petrochemical and radionuclear technologies, with particular reference to winning the losing war against cancer. These proposals are also applicable to the poorly recognized, potentially adverse public health and environmental hazards of emerging technologies, particularly genetically engineered food production. The proposals embody fundamental democratic rights—the right to know and balanced and transparent decision making—the “Precautionary Principle,” reduction in the use of toxics, incentives for the development of safe industrial technologies, and criminal sanctions for suppression or manipulation of information.

Use of phenological stages of the fruits and physicochemical characteristics of the oil to determine the optimal harvest time of oil palm interspecific OxG hybrid fruits

2013 ◽  
Vol 49 ◽  
pp. 204-210 ◽  
Author(s):  
Sandra Milena Rincón ◽  
Paola Andrea Hormaza ◽  
Leidy Paola Moreno ◽  
Fausto Prada ◽  
Daysy Jazmín Portillo ◽  
...  
Keyword(s):  
Oil Palm ◽  
Physicochemical Characteristics ◽  
Harvest Time ◽  
Phenological Stages ◽  
Optimal Harvest

scholarly journals Valorisation of Ensiled Fodder Beets

1970 ◽  
Vol 66 (2) ◽  
Author(s):  
Thomas LAUWERS ◽  
Jo VICCA ◽  
Joos LATRE ◽  
Didier HUYGENS ◽  
Dirk LIPS
Keyword(s):  
Dry Matter ◽  
Nutritive Value ◽  
Energy Yield ◽  
Harvest Time ◽  
Point Of Interest ◽  
Optimal Harvest ◽  
Feeding Value ◽  
High Level ◽  
Matter Basis ◽  
The Ideal

Fodder beets (Beta vulgaris L.) are especially respected for their high feeding value and high netto-energy yield per hectare. The price per nutritive value is lowest as compared to other forages. Preservation of fodders beets demands thorough cleaning without damaging and regularly occurs as a whole in well closed piles. In addition, feeding them to the animals is labour demanding. These disadvantages enforce the research towards other preservation methods which may be able to valorise this valuable type of roughage. The preservation of fodder beets in silages using silo bags, either separately or in combination with maize was investigated. Fodder beets were harvested and ensilaged at the ideal moment of maize harvest (October) or fodder beets were harvested at the ideal moment for fodder beet harvest (November) and consequently ensilaged with previously ensilaged maize. Highest energy yields of the silages were recorded at optimal harvest time for fodder beets. Ensilaging fodder beets separately resulted in large energy losses due to effluent and dry matter losses. Using lab scale silage, possible solutions for these large losses were investigated. Addition of 10% maize did reduce the effluent losses but dry matter losses remained at a high level. Addition of 4,5 l propionic acid per ton beets reduced effluent and dry matter losses sufficiently. Ensilaging foliage was another point of interest. This appeared to result in a lowered energy yield at organic and dry matter basis, an increased amount of ashes and doubling of the iron (Fe) concentration

scholarly journals The study of systemic hemodynamic disorders of patients with varicose and post-thrombotic diseases

2020 ◽  
Vol 19 (2) ◽  
pp. 32-37
Author(s):  
I. N. Shanaev
Keyword(s):  
Blood Flow ◽  
Right Ventricle ◽  
Right Atrium ◽  
Ultrasound Examination ◽  
Anterior Wall ◽  
Right Heart ◽  
Normal Limits ◽  
Flow Through ◽  
The Right ◽  
Restrictive Type

Aim. Study of heart function in the patients with CVD. Materials and methods. 46 patients with varicosity (VD) and 34 patients with post-thrombotic disease (PTD) were examined; the control group was represented by 15 healthy volunteers. The diagnosis was established using the CEAP basic classification. The study did not include patients with a diagnosed arterial hypertension, diabetes mellitus, chronic lung disease, significant hemodynamic heart defects, coronary heart disease. Ultrasound examination of the heart and veins of the lower extremities was performed on a Saote My Lab Alpha, Acuson Sequoia 512 apparatus. In addition to the standard protocol of heart ultrasound examination, the parameters of the right heart were calculated: sizes of the right ventricle (RV), right atrium, thickness of the anterior wall of the pancreas; to assess the ejection fraction (EF) of the pancreas the mobility of the lateral edge of the tricuspid ring was calculated, and the pressure on the tricuspid valve (TV) was measured. Diastolic ventricular function was studied by spectrograms of tricuspid and mitral blood flow. Results. Most of the indicators of cardiac activity in patients with VD were within normal limits, but a tendency to increase increasing of the right heart size was noted. In addition, the thickness of the interventricular septum and the right ventricle (RV) anterior wall was found to increase from 0.8 to 1.1 cm and from 0.3 to 0.5 cm, respectively, according clinical classes from C2 to C6 (CEAP). Eject fraction (EF) of both the RV and the left ventricle (LV) were also within normal limits, but with a tendency to decrease (67.8 % – C2, to 62 % – C6). The growth of the clinical class is followed by the increasing of percentage of non-restrictive blood flow through the tricuspid valve (TV). The restrictive type of blood flow in patients with VD had not been identified. Patients with PTD also showed a tendency to increase the right heart. However, whereas the size of the RV, as a rule, did not exceed 3.0 cm, the size of the right atrium was slightly higher than normal one in the clinical class C4 and C5.6. All the patients had EF of LV within normal limits, but it slightly decreased by the growth of class. Only patient classes C3 and C4 had EF of RV within the normal range. The 18 % of patient class C5.6 had EF lower than normal with value 48%. Diastolic dysfunction (DD) of the RV was detected in 73.3% of patients with class C3 and 100% with classes C4 and C5.6. Moreover, a restrictive type of blood flow through TV appeared from class C4 and the percentage increased up to 27.2% (class C5,6). Conclusions. DD of the RV was the main hemodynamic disorder.

Effect of different substrates on survival and growth of juveniles of the freshwater narrow-clawed crayfish Astacus leptodactylus Eschscholtz, 1823 (Decapoda, Astacidae)

Crustaceana ◽  
2017 ◽  
Vol 90 (11-12) ◽  
pp. 1289-1302 ◽  
Author(s):  
Yavuz Mazlum ◽  
Ozlem Guner Gurlek ◽  
Sinem Sirin
Keyword(s):  
Survival Rate ◽  
Treatment Group ◽  
Total Yield ◽  
Control Group ◽  
Astacus Leptodactylus ◽  
Growth Increase ◽  
Key Factor ◽  
Flow Through ◽  
Survival And Growth ◽  
Intermediate Value

Substrate is a key factor for successful crayfish culture, and it can be used to increase the survival rate. The effects of substrate on the survival and growth ofAstacus leptodactylusEschscholtz, 1823 were evaluated in flow-through compartments, divided into three sections and with two different substrates, over a period of 90 days. The three treatments used in the study were: artificial ropes, small stones, and a control group that received no substrate. The survival rate was highest in the small-stones treatment group (77.3%) and was lowest in the without-substrate treatment group (41.3%), while the artificial-ropes group showed an intermediate value (65.3%). Total yield was lower in the control group, 22.46% (25.0 g) as compared to the small-stones treatment group, with 42.3% (51.3 g) and the artificial-ropes treatment with 35.51% (55.8 g). In addition, cheliped injuries were found in higher proportion in the group without cover, and the artificial ropes yielded better results compared to the small-stones and no-substrate group in regard of the growth-increase rate.

scholarly journals Switchgrass Harvest Time Effects on Nutrient Use and Yield: An Economic Analysis

2014 ◽  
Vol 46 (4) ◽  
pp. 487-507 ◽  
Author(s):  
Nathanial Cahill ◽  
Michael Popp ◽  
Charles West ◽  
Alexandre Rocateli ◽  
Amanda Ashworth ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Yield Loss ◽  
Maximum Yield ◽  
Sensitivity Analyses ◽  
Harvest Time ◽  
Economic Consideration ◽  
Nutrient Use ◽  
Optimal Harvest ◽  
The Cost ◽  
Economic Tradeoffs

This article analyzes economic tradeoffs among harvest date, fertilizer applied, nutrient removal, and switchgrass yield as they vary with respect to input and output prices. Economic sensitivity analyses suggest that higher biomass prices lead to earlier harvest. Optimal harvest time occurs beyond time of maximum yield because nutrient removal in the biomass is an important economic consideration. Switchgrass price premia that reflect the cost of non-optimal harvest time are driven by standing crop yield loss, nutrient removal, storage loss, and opportunity cost. These price premia could provide a mechanism to compensate producers for alternative harvest times and aid with logistics management.

Free Zone Electrophoresis of Clotting Factors

1979 ◽  
Author(s):  
T. Cartwright ◽  
C.H. Dickerson ◽  
D.E.G. Austen
Keyword(s):  
Factor Viii ◽  
Total Yield ◽  
Solid Matrix ◽  
Clotting Factors ◽  
Free Zone ◽  
Zone Electrophoresis ◽  
Flow Apparatus ◽  
Electrophoresis System ◽  
Flow Through ◽  
Set Up

A free-zone electrophoresis system is used for rapid production of substantially purified factor VIII from either citrated plasma or from a factor VIII Concentrate of intermediate purety. Using concentrate, a total yield of 43% of clotting activity is obtained with fibrinogen reduced to approximately 30% of its starting level. Protein level is reduced to 20% of the original value. Using plasma, the albumin, factor VIII and fibrinogen were all separated from factor VIII. In these experiments, factor-VIII-related antigen migrates with the coagulant factor VIII illustrating that both have similar mobilities equivalent to that of an alpha-globulin, or else that they are connected together. The particular advantage of this separation is that it is carried out in a continuous flow apparatus in liquid buffer with no solid matrix and that once the apparatus is set up, material can flow through the machine at a rate of 5 mls/min being continuously separated. The main problem and area for further study is that of concentrating the relatively dilute fractions without undue loss.

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